EP1529485A1 - Dispositif et procédé de caméra intrabuccale pour la génération d'une image alignee d'un objet intrabuccal, en particulier de dents d'un patient - Google Patents

Dispositif et procédé de caméra intrabuccale pour la génération d'une image alignee d'un objet intrabuccal, en particulier de dents d'un patient Download PDF

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Publication number
EP1529485A1
EP1529485A1 EP04022621A EP04022621A EP1529485A1 EP 1529485 A1 EP1529485 A1 EP 1529485A1 EP 04022621 A EP04022621 A EP 04022621A EP 04022621 A EP04022621 A EP 04022621A EP 1529485 A1 EP1529485 A1 EP 1529485A1
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EP
European Patent Office
Prior art keywords
camera
intraoral
light
tooth
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04022621A
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German (de)
English (en)
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EP1529485B1 (fr
Inventor
Harald Kerschbaumer
Gottfried Rohner
Walter Pokorny
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Ivoclar Vivadent AG
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Ivoclar Vivadent AG
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Publication of EP1529485A1 publication Critical patent/EP1529485A1/fr
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0676—Endoscope light sources at distal tip of an endoscope

Definitions

  • the present invention relates to an intraoral camera device according to the preamble of claim 1 and a Method according to the preamble of claim 12.
  • intraoral camera system and camera device referred
  • intraoral camera system and camera device referred
  • Such systems are used in a variety of environments, including in Situations in which the dentist has certain characteristics of a Patient's mouth show and illustrate wants.
  • This intraoral Camera systems are becoming more and more the key to complex diagnosis and treatment planning.
  • the research has shown that about 30% of practicing dentists in the age group 35-54 years intraoral camera systems own and use. It is expected that this Percentage with increasing familiarity with such systems will increase, as is clear from the Dental Procedures Report, Pages 22 to 24, February 1995, is apparent.
  • Intraoral camera systems are often used in dental restoration procedures used. Many people opt for today clinical interventions, her smile and her outward appearance upgrade by restorative procedures. Both Most of these procedures is the change of the tooth shape, the Tooth position and / or the color of the tooth involved.
  • a necessary step in changing the color of a Tooth of a patient is the determination of "coloring" or "shade" of the present tooth.
  • the Tooth color of the existing teeth of the persons after a strive for a whiter, brighter smile, rated, so that a comparison can be made between before and after can. Coloring is even more important for people need the dentures; it is an aim of such restoration methods, to gain a natural appearance. For this reason, it is important to change the hue of the existing one To know tooth, so that the new restoration exactly can be matched to him.
  • the invention is based on the object, an intraoral Camera device according to the preamble of claim 1 and a method for producing an axially aligned Image of an intraoral object according to the generic term of claim 12, which provides a quick pick-up allow, avoiding a cumbersome operation should be without the quality of the recording suffers.
  • an intraoral camera is a computer-aided Target setting for taking images intraoral Objects ready.
  • the target setting ensures that the image of an intraoral object or a region, for example a patient's tooth, in the desired size, in the desired angle and recorded in the desired position becomes.
  • the destination setting facilities can use a substantially punctiform light source which is directed to the object of interest, the just in sight of the camera or aimed at this.
  • the punctiform light source may be a laser diode or another light source that is a point of light or creates a limited light range.
  • the punctiform Light source can also be integrated into the camera.
  • Under punctiform Lichario is not the shape of the Understood light source itself, but the nature of the Emitted light source and on a lighting area incident radiation. This is preferably punctiform, so essentially circular, so they as well Light spot or can be referred to as a light spot.
  • Light emitted by the point light source emitted by is reflected by an object of interest, according to the invention rated to determine if a camera is watching is directed to a location from which the desired image should be included.
  • the evaluation is a picture detail used by the camera.
  • the image section can be selected in this way be that he is suitable in form and size for the point of light is that of the punctiform light source when hitting a subject or an area of interest is produced.
  • the distance between the camera and its target is preferably a fixed distance, which is determined by the Use of a short spacer tube or a spacer is determined.
  • the operators may be provided with information defining in which Distance the pictures should be taken.
  • a geometric pattern like a grid, grid points, an intensity distribution or the like ie a two-dimensional reference system
  • the correction can be done by a corresponding signaling "panning" in the relevant Be realized direction. It is also possible to have an optical or to give an acoustic signal indicating that the Camera is now exactly targeted.
  • the Shutter release for the camera only release when the target orientation is made. It is also possible the targeting as a kind of trigger signal for triggering too use, so that when you press the shutter button, the image capture only realized when the targeting given is.
  • light point here is meant a limited range of light.
  • a light spot is referred to here as a light spot.
  • the image detail of a camera used to rate the camera orientation is used is in an advantageous embodiment for use in the evaluation in sub-sections.
  • subsections for example, their light properties
  • the sub-sections For example, grid fields of the above-mentioned Be grid. It is also possible over intensity gradations the light intensity a realization of sub-sections make.
  • Target setting devices such as a destination setting software can be used to indicate if the camera is essentially goal-oriented based on Light information from that of the punctiform light source generated light. It can be an audible or visible sign to be provided. For example, a specific Section of a display of a camera showing a green light, to indicate a suitable orientation. Appealing to it a picture of the current camera can not be taken and taken be stored automatically or manually. If desired the system can be configured to do this Operator is allowed to make a selection, one at a time to enable automatic image capture.
  • the intraoral Camera automates to a fast, accurate and reliable To provide an image of an intraoral object.
  • a punctiform light source for example a laser diode, is used to determine when a camera is in an intraoral Camera system the desired position for recording has reached an image.
  • the intraoral camera system automatically takes the picture, without requiring the assistance of an operator, if certain criteria are met. For this the picture in Image sections are divided, which are ever evaluated.
  • the image excerpts have a shape suitable for that of the punctiform Light source generated by the point of light on the intraoral Object seems suitable.
  • the section is preferred subdivided into sections for comparative analysis can be used, thereby setting the target the intraoral camera is detected.
  • Fig. 1 shows a functional block diagram of a first embodiment an intraoral camera system.
  • Fig. 1 shows a intraoral camera system 10, which is used to obtain image information a patient's tooth is used.
  • the camera system 10 can in particular, values for color or shape properties of a tooth. This is possible determine the tooth shade ever considered over the tooth, and it Any other observations can be made.
  • the intraoral camera system 10 an image recording device 12, a display device 14, a memory 16, a user interface 18, a Processing means 22 and a target setting means 26 on.
  • the image pickup device 12 is a Device for obtaining information about physical and / or color properties of a patient's tooth.
  • the Image capture device includes a digital camera (e.g. intraoral camera).
  • Examples of the image pickup device 12 are the camera Power 0/00, by the company Insight is manufactured in San Carlos, California, and that from Cygnus Instruments, Inc. of Goleta, California manufactured model Cygenascope. Another example is this Model VistaCam on.
  • Such cameras are free handheld cameras.
  • the cameras typically have a display, a memory, software, and a Interface for communication with a PC.
  • Such Cameras are capable of adjusting the brightness, the color, the hue, to capture the color or the color saturation and thereby taking a picture.
  • the color can be in any suitable coding, for example broken down into RGB, according to L *, a *, b *, or in any other suitable manner, be recorded.
  • the image pickup device 12 an integrated display such as an LCD display the back of the digital camera.
  • the display device 14 an operator can take a picture of a Looking at the patient's tooth. Also, certain software analysis features be used, for example, for color analysis. Such detected parameters can also be found on the Display device are recorded. It is according to the invention provided that the display device 14 in any case indicates that what is currently in the visor of the camera, so from the camera is detected. Instead of the digital LCD display a camera can also use a computer monitor which is coupled to the camera, hence the display information delivered to the computer monitor.
  • the memory 16 typically stores the Image and additionally certain image parameters. For example can use color guide information, for example certain color properties of tooth shades, according to a suitable shade scheme table, be stored.
  • the serves Memory 16 as a buffer. He can be a semiconductor memory or a hard disk or any other storage, for example in a computer. It is also possible, apart from the image memory, for example, in the image pickup device 12 to use a separate memory while also storing on media such as a CD or a DVD is possible.
  • a user interface 18 can be known elements be used. These include a keyboard, a mouse, a voice recognition system and the like.
  • the user interface 18 allows the operator to access the image capture device 12 to act in a suitable manner, for example to take a picture, to choose the resolution of the pictures, the To set the tooth to be recorded and the like.
  • the processing device 22 is typically a microprocessor or a microcomputer whose software is analyzing and identification of tooth shades, and with which the required feature for image capture provided becomes. It is known that the necessary elements for this purpose both by appropriate circuits as well as by appropriate Software can be provided.
  • For example can be a computer like a PC for the processing device 22 be provided, which of course also possible is the elements already provided in the PC, such as memory, Display, user interface and communication device as well Output device, provided for according to the invention Elements of the display device 14, the user interface 18, the memory 16, the communication device 20 and the Recording device 22 at least partially to use. It can be separate processors or even combinations of different ones Processors, partly in the camera, partly in the PC can be provided.
  • an alignment device or destination adjustment device 26 provided.
  • the destination setting device 26 helps the operator to align the image pickup device 22.
  • a plurality of components be provided in the system 10.
  • this includes a point light source, for example a Laser diode, or a sharply focused LED.
  • a point light source for example a Laser diode, or a sharply focused LED.
  • the hardware and software that the image information of the light spot, that of the punctiform Light source is generated on the tooth.
  • the intraoral camera device 10 may be part of a device to be for color analysis. Examples of color analysis facilities are disclosed in US Pat. No. 6,305,933 B1 and in WO 00/25696, with reference to these two documents is fully incorporated by reference. It is preferable that one short tube is used for the secondary light shielding, so that the recorded images are not distorted by secondary light become. Such a tube is for example in the U.S. Patent 6,210,159, also incorporated herein by reference Reference is made.
  • FIG. 2 An example of an intraoral camera device is off Fig. 2 can be seen, wherein at the same time the connection with a PC is shown.
  • the intraoral Camera device 30 indicates that the targeting is correct and an image of the patient's tooth can be taken.
  • the intraoral Camera device comprises a PC 32 and an image pickup device 34 on.
  • a computer monitor 36 connected as a display device.
  • the image pickup device 34 detects the color and Shape information of the patient's tooth.
  • On this computer monitor 36 is displayed, indicating the image capture device just captured, so what lies in the sights of the camera.
  • Setting can also be a saved image on the Show monitor.
  • At the same time can over the PC 32 and / or over the hardware of the image pickup device 34 analyzes the Picture be made.
  • Analyzes can be made to see if the image pick-up device 34 properly on the interested Object is targeted. If desired, others can do so Functions are performed, such as identification of shades from a color scheme table.
  • the image pickup device 34 has the target setting device to assist the operator. As a result, the image pickup device 34 can be more correct Align way.
  • FIGS. 3 and 4 schematically show suitable image recording and target adjustment devices.
  • the correct target setting depends on the Angle that a camera has on a subject.
  • the present camera angle is analyzed, to determine whether the angle in question is correct or Not.
  • FIGS. 3 and 4 each show a camera 44, which is aligned with a tooth surface 46.
  • the Tooth surface 46 is typically convex, for illustrative purposes the proportions are exaggerated.
  • One Incisor has, for example in the middle region one plane, but textured surface, which then to the Side flanks, ie in the mesial or distal direction is curved. If an alignment error a camera would different shades of color for the considered areas or "shades" result, so that the result of the restoration falsifies would. To prevent this, it is according to the invention intended to use the Zieleinstell sensible 26 (Fig. 1).
  • the punctiform light source 48 aligned on the tooth surface 46.
  • the punctiform Light source 48 is in the illustrated embodiment mounted on the camera 44, in such a way that they optical axis 49 is closely adjacent, but from this is spaced.
  • the light source 48 is in a small angle of for example 1 to 10 ° opposite the optical axis 49 mounted on the camera.
  • the alignment is chosen so that at a given distance between camera 44 and tooth surface 46 of the impact of the optical axis 49 coincides with the light spot passing through the light source 48 is generated. It is understood that by doing so also a distance specification takes place, which at the same time the Focusing the image pickup device 12 in the camera 44th facilitated.
  • both light sources 48 and 50 in the same, but mirror-symmetrical, angle are arranged to the camera. It is understood that instead including any other number of suitable light sources for example, provided in a circle around the camera distributed could be.
  • FIG. 5 is a flowchart-like scheme it can be seen that the required for the inventive method Steps shows.
  • a camera focused on a patient's tooth to create a picture of the tooth.
  • visual information becomes about what is being captured by the camera becomes.
  • a punctiform light source for Example, a laser diode, aimed at the patient's tooth, for example, the integrated light source 48 or 50 according to Fig. 3 and Fig. 4. It is understood that instead of basically also an external light source on the patient's tooth could be directed.
  • step 36 via the destination setting device 26 figured out when the camera was essentially purposeful is.
  • step 70 it is then displayed whether the camera is targeted.
  • an audible or visible display device is provided indicating to the operator that the camera is targeted is.
  • step 72 then the image of the patient's tooth can be recorded, for example automatically if in step 70 before that for a certain Time is displayed that the camera is targeted.
  • steps 62 and 66 typically become made by the user while the cuts 64, 66, 70 and 72 in the preferred embodiment automatically, ie computer-aided.
  • the target setting is preferably such that a limited Extract of the captured image is evaluated. This is in Individual shown in Fig. 6.
  • the image capture device is focused on a particular one of interest Intra-oral object, so usually the to be detected Tooth, being aligned.
  • the picture information will be then - as recorded in step 84 - captured, where a default or preselected section is specified is that represents a small part of the whole picture.
  • the Area of the relevant section for example, less than 10%, in particular less than 1% of the total image, include.
  • the cut-out size depends on the light spot and its size and shape from the light source 48 and 50 on the Tooth is generated. In any case, it is provided according to the invention that the cut captures the entire light spot.
  • the image information becomes of the clipping to determine if the camera is properly aligned with the intraoral object. For example, image information regarding color, the shape and the brightness of the punctiform Light source generated light point can be evaluated to this determine.
  • steps 84 and 86 are typically steps taken by the computer while step 82 is being performed by the operator.
  • Fig. 7 it can be seen how the image information Is evaluated.
  • image information Is evaluated.
  • the section in step 94 divided into sub-sections.
  • the Definition can be made here automatically, but if necessary also by an adjustment by the operator.
  • Preferably contains every subsection has an equal number of pixels, For example, 20 pixels, it being understood that any other divisions can be made.
  • step 96 the image information of the sub-sections will now be detected. These include the light parameters of each Subsection, which then compares in step 98 become. According to step 100, it is then determined whether one of the Undercuts the desired cutout is that of the middle of the tooth.
  • a Camera view 102 which has an image of a tooth 104, evaluated can be.
  • Light from a point light source can be directed to the tooth 104 to a point of light 106 on the tooth 104 to produce.
  • the grid (section 108) is a section used to evaluate light properties of the light generated by the punctiform light source is selected when the light falls on the tooth 104.
  • FIG. 8 Further down in Fig. 8 is an enlargement of the detail 108 and the light spot 106 shown.
  • the grid (detail 108) according to the invention in a variety of fields (Sub-sections 109) divided. This cutout can be a Have shape and size selected to be suitable for the typical shape and size of the light spot 106 is suitable. An exact alignment is only achieved when the Light point of the light source in the central field of the grid (detail 108). It is understood that typical camera distances be used and the size of the generated Point of light can be determined empirically. Examples for Intra-oral camera systems are illustrative in the references P 101 20 717.4 and P 101 26 887.4 shown on which is hereby incorporated by reference.
  • FIGS. 9 to 11 show a camera according to the invention in FIG schematic representation visible.
  • Each punctiform Light source 206 is in this embodiment by five formed next to each other in series laser diodes 204, formed laterally adjacent to the lens 202 of the camera are. It is understood that instead of a individual laser diode 204 can be realized.
  • Fig. 11 shows in addition a short spacer tube with a ring 208 for the attachment to the patient or the patient's tooth suitable is formed and the distance between camera and tooth sets. It is understood that such a spacer ring However, according to the invention is not required.

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EP04022621A 2003-11-10 2004-09-23 Dispositif et procédé de caméra intrabuccale pour la génération d'une image alignee d'un objet intrabuccal, en particulier de dents d'un patient Not-in-force EP1529485B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10352394A DE10352394B4 (de) 2003-11-10 2003-11-10 Intraorale Kameraeinrichtung sowie Verfahren zum Erzeugen eines ausgerichteten Bildes eines intraoralen Gegenstandes, insbesondere eines Patientenzahnes
DE10352394 2003-11-10

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EP1529485A1 true EP1529485A1 (fr) 2005-05-11
EP1529485B1 EP1529485B1 (fr) 2008-02-13

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EP04022621A Not-in-force EP1529485B1 (fr) 2003-11-10 2004-09-23 Dispositif et procédé de caméra intrabuccale pour la génération d'une image alignee d'un objet intrabuccal, en particulier de dents d'un patient

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US (1) US7106958B2 (fr)
EP (1) EP1529485B1 (fr)
JP (1) JP4071761B2 (fr)
AT (1) ATE385732T1 (fr)
DE (2) DE10352394B4 (fr)

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ATE385732T1 (de) 2008-03-15
US7106958B2 (en) 2006-09-12
DE10352394A1 (de) 2005-06-23
JP2005144171A (ja) 2005-06-09
US20050100333A1 (en) 2005-05-12
EP1529485B1 (fr) 2008-02-13
DE502004006175D1 (de) 2008-03-27
JP4071761B2 (ja) 2008-04-02

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